US7207643B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
US7207643B2
US7207643B2 US10/634,381 US63438103A US7207643B2 US 7207643 B2 US7207643 B2 US 7207643B2 US 63438103 A US63438103 A US 63438103A US 7207643 B2 US7207643 B2 US 7207643B2
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United States
Prior art keywords
heads
recording
overlapped region
image data
recording heads
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Expired - Lifetime, expires
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US10/634,381
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US20040041863A1 (en
Inventor
Ken Ioka
Yasuhiro Komiya
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Riso Kagaku Corp
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Olympus Optical Co Ltd
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Assigned to ORTEK CORPORATION reassignment ORTEK CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OLYMPUS CORPORATION
Assigned to RISO KAGAKU CORPORATION reassignment RISO KAGAKU CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OLYMPUS CORPORATION
Assigned to RISO KAGAKU CORPORATION reassignment RISO KAGAKU CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ORTEK CORPORATION
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2135—Alignment of dots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/20—Modules

Definitions

  • the present invention relates to an image forming apparatus.
  • a high-speed image forming apparatus capable of simultaneously forming images of a plurality of lines by one-time scan by arranging a plurality of recording heads in substantially the same direction as a nozzle arranging direction such that overlapped regions are formed between the heads is conventionally known.
  • various methods of improving image forming apparatuses of this type have been proposed.
  • Jpn. Pat. Appln. KOKAI Publication No. 5-57965 discloses an image forming apparatus which eliminates density unevenness in the head overlapped regions.
  • An image forming apparatus comprises a recording head unit in which a plurality of recording heads are arranged in substantially the same direction as the arranging direction of recording elements such that an overlapped region is formed between the heads, a detector which detects a width of the overlapped region of each of the plurality of recording heads from a predetermined test chart printed using the recording head unit, and an image data distributor which distributes image data input to each of the a plurality of recording heads, in accordance with the detected width of the overlapped region between the heads.
  • An image forming apparatus comprises a recording head unit in which a plurality of recording heads are arranged in substantially the same direction as the arranging direction of recording elements such that an overlapped region is formed between the heads, a detector which detects a set angle of each of the plurality of recording heads from a predetermined test chart printed using the recording head unit, and a driving timing correction unit which, when driving the recording elements of each of the plurality of recording heads, corrects the driving timing of each recording element in accordance with the detected set angle.
  • An image forming apparatus comprises a recording head unit in which a plurality of recording heads are arranged in substantially the same direction as the arranging direction of recording elements such that an overlapped region is formed between the heads, a detector which detects a set angle and a width of the overlapped region of each of the plurality of recording heads from a predetermined test chart printed using the recording head unit, an image data distributor which distributes image data input to each of the plurality of recording heads, in accordance with the detected width of the overlapped region between the heads, and a driving timing correction unit which, when driving the recording elements of each of the plurality of recording heads in accordance with the distributed image data, corrects the driving timing of each recording element in accordance with the detected set angle.
  • FIG. 1 is a view showing an outline of a recording head unit including a plurality of recording heads to which the present invention is applied;
  • FIG. 2 is a view for explaining printing of test charts used in this embodiment
  • FIG. 3 is a block diagram showing the arrangement of an image forming apparatus according to this embodiment
  • FIG. 4 is a flow chart of a line image determination process performed by a line image determinator 12 ;
  • FIGS. 5A to 5C are views for explaining an image distribution process performed by an image data distributor 15 ;
  • FIG. 6 is a view showing an example in which the image forming apparatus of this embodiment is applied to a high-speed recording apparatus capable of color printing.
  • FIG. 1 is a view showing an outline of a recording head unit including a plurality of recording heads of an inkjet printer to which the present invention is applied.
  • a plurality of recording heads 2 - 1 , 2 - 2 , . . . , 2 -n are arranged on a base 1 in substantially the same direction as the arranging direction of nozzles (recording elements; 2 - 11 , 2 - 12 , . . .
  • a recording head unit having this arrangement records one page on a recording medium by performing scan at least once.
  • FIG. 2 is a view for explaining printing of test charts used in this embodiment.
  • test charts 5 - 1 , 5 - 2 , and 5 -n are formed by performing printing four times by using the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n, respectively.
  • the set angles of the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n and the widths of the overlapped regions 3 A and 3 B can be detected.
  • the detected set angles and overlapped region widths are stored as correction data.
  • the discharge timings of the nozzles of the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n are corrected in accordance with the set angle data, and input image data to the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n is distributed in accordance with the overlapped region widths.
  • FIG. 3 is a block diagram showing the arrangement of an image forming apparatus according to this embodiment.
  • test charts as explained with reference to FIG. 2 are formed by driving the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n on the basis of test chart data 14 .
  • the formed test charts are read by a test chart reader 19 such as a scanner, and the set angles and overlapped region widths of the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n are detected by a set angle/overlapped region detector 20 .
  • the detected set angles and overlapped region widths are stored as correction data in a correction data storage 17 .
  • a message display (notification unit) 18 displays a message which demands head replacement or adjustment if the detected set angle or overlapped region width exceeds an allowable range. If even one of the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n is replaced or adjusted, a new test chart is printed, and the set angles and overlapped region widths of the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n are detected again by using the printed test chart.
  • an image data processor 10 performs image processing, e.g., converts input RGB image data into CMYK image data.
  • a line image determinator 12 determines, for each overlapped region width, whether image data in the overlapped region is a line image by using the overlapped region width data stored in the correction data storage 17 .
  • the determination result is stored in a determination result storage 11 .
  • Image data subjected to the determination by the line image determinator 12 is binarized by a binarizer 13 , and input to an image data distributor 15 .
  • the image data distributor 15 distributes the input image data on the basis of the line image information stored in the determination result storage 11 and the overlapped region width data stored in the correction data storage 17 . This image data distribution process will be described later.
  • the image data thus distributed on the basis of the overlapped regions is supplied to a discharge timing correction unit (driving timing correction unit) 16 .
  • the discharge timing correction unit 16 corrects the discharge timings of the nozzles of the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n on the basis of the set angle data stored in the correction data storage 17 .
  • the recording heads 2 - 1 , 2 - 2 , . . . , 2 -n print an image by discharging ink from the nozzles at the corrected discharge timings in accordance with the input image data.
  • FIG. 4 is a flow chart of the line image determination process in the line image determinator 12 .
  • the line image determinator 12 determines whether input image data has an overlapped region (step S 1 ). If NO in step S 1 , the line image determinator 12 terminates the line image determination process by doing nothing (step S 5 ). If YES in step S 1 , the line image determinator 12 extracts an input image corresponding to the overlapped region (step S 2 ). Then, the line image determinator 12 extracts features of the extracted image data and determines whether the image data is a line image in accordance with a known method (step S 3 ).
  • step S 4 The result of the determination of whether the image data is a line image is stored in the determination result storage 11 in accordance with the overlapped region. The flow then returns to step S 1 to determine whether there is another overlapped region. If there is another overlapped region, the line image determinator 12 performs the processing from step S 2 . If there is no more overlapped region, the line image determinator 12 completes the line image determination process.
  • FIGS. 5A to 5C are views for explaining the image distribution process in the image data distributor 15 .
  • FIG. 5A if printing is directly performed by using the recording heads 2 - 1 and 2 - 2 having some overlapped nozzles, printed images are overlapped in the overlapped region 3 A by ink discharged from the overlapped nozzles.
  • image data is so distributed that complementary printing is performed in the overlapped region 3 A by alternately driving the recording heads 2 - 1 and 2 - 2 .
  • image data is a natural image
  • the overlapped region 3 A is beautifully printed.
  • image data is found to be a line image, the image printed by complementary printing cannot be linear (the image is zigzagged), so no clear line image can be printed ( FIG. 5B ).
  • FIG. 5C shows an example of an image printed by driving only the recording head 2 - 2 in the overlapped region 3 A. In this way, a clear line image can be printed in the overlapped region 3 A.
  • FIG. 6 is a view showing an example in which the image forming apparatus of this embodiment is applied to a high-speed recording apparatus capable of color printing.
  • Reference numerals 100 - 1 and 100 - 2 denote paper feed rollers; and 101 , a head fixing device in which recording heads 102 - 1 , 102 - 2 , and 102 - 3 for cyan (C), recording heads 103 - 1 , 103 - 2 , and 103 - 3 for magenta (M), recording heads for yellow (Y), and recording heads 104 - 1 , 104 - 2 , and 104 - 3 for black (K) are so arranged as to have overlapped regions between the heads.
  • C recording heads 102 - 1 , 102 - 2 , and 102 - 3 for cyan (C)
  • recording heads for yellow (Y) and recording heads 104 - 1 ,
  • the set angles and the widths of overlapped regions of a plurality of recording heads are detected from test patterns printed in advance.
  • input image data is distributed on the basis of the detected overlapped region widths, and the discharge timings of nozzles are corrected on the basis of the detected set angles. Therefore, density unevenness in the head overlapped regions can be eliminated only by rough head alignment.
  • the present invention comprises a recording head unit in which a plurality of recording heads are arranged in substantially the same direction as the arranging direction of recording elements such that an overlapped region is formed between the heads, a detector which prints a predetermined test chart by using the recording head unit, and detects the width of the overlapped region of each of the plurality of recording heads from the printed test chart, and an image data distributor which distributes image data input to each of the plurality of recording heads, in accordance with the detected width of the overlapped region between the heads.
  • the present invention comprises a recording head unit in which a plurality of recording heads are arranged in substantially the same direction as the arranging direction of recording elements such that an overlapped region is formed between the heads, a detector which prints a predetermined test chart by using the recording head unit, and detects the set angle of each of the plurality of recording heads from the printed test chart, and a driving timing correction unit which, when driving the recording elements of each of the plurality of recording heads, corrects the driving timing of each recording element in accordance with the detected set angle.
  • the present invention comprises a recording head unit in which a plurality of recording heads are arranged in substantially the same direction as the arranging direction of recording elements such that an overlapped region is formed between the heads, a detector which prints a predetermined test chart by using the recording head unit, and detects the set angle and the width of the overlapped region of each of the plurality of recording heads from the printed test chart, an image data distributor which distributes image data input to each of the plurality of recording heads, in accordance with the detected width of the overlapped region between the heads, and a driving timing correction unit which, when driving the recording elements of each of the plurality of recording heads in accordance with the distributed image data, corrects the driving timing of each recording element in accordance with the detected set angle.
  • an image forming apparatus capable of eliminating density unevenness in the head overlapped regions only by rough head alignment can be provided.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Printers Characterized By Their Purpose (AREA)
US10/634,381 2001-02-06 2003-08-04 Image forming apparatus Expired - Lifetime US7207643B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001029835 2001-02-06
JP2001-029835 2001-02-06
PCT/JP2002/000890 WO2002062581A1 (fr) 2001-02-06 2002-02-04 Appareil à formation d'image

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/000890 Continuation WO2002062581A1 (fr) 2001-02-06 2002-02-04 Appareil à formation d'image

Publications (2)

Publication Number Publication Date
US20040041863A1 US20040041863A1 (en) 2004-03-04
US7207643B2 true US7207643B2 (en) 2007-04-24

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US10/634,381 Expired - Lifetime US7207643B2 (en) 2001-02-06 2003-08-04 Image forming apparatus

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US (1) US7207643B2 (ja)
EP (1) EP1375146B1 (ja)
JP (1) JP4253504B2 (ja)
KR (1) KR100845648B1 (ja)
CN (1) CN100333912C (ja)
DE (1) DE60231080D1 (ja)
TW (1) TW523465B (ja)
WO (1) WO2002062581A1 (ja)

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JP2011148317A (ja) * 2011-03-29 2011-08-04 Seiko Epson Corp 印刷装置、コンピュータプログラム、印刷システム、及び、インク滴の吐出方法
JP5968797B2 (ja) * 2013-01-21 2016-08-10 富士フイルム株式会社 ヘッド調整方法、ヘッド駆動装置および画像形成装置
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WO2002062581A1 (fr) 2002-08-15
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TW523465B (en) 2003-03-11
JP4253504B2 (ja) 2009-04-15
CN100333912C (zh) 2007-08-29
EP1375146A4 (en) 2006-02-22
EP1375146A1 (en) 2004-01-02
US20040041863A1 (en) 2004-03-04
KR20030070141A (ko) 2003-08-27
CN1491160A (zh) 2004-04-21
JPWO2002062581A1 (ja) 2004-06-03

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